BirdAnalyst
Species · BCR 13 · BBS 2025 Release · 1966–2024

Common Grackle In Lower Great Lakes / St. Lawrence Plain

All regionsLower Great Lakes / St. Lawrence PlainGeneralists

Common Grackle in Lower Great Lakes / St. Lawrence Plain has fallen sharply: down 65% on the route-weighted index since 1968.

-65%Since 1968
86Routes In Region
58Years

Notable Signals

long arc declinecomputed index

Common Grackle has fallen sharply in Lower Great Lakes / St. Lawrence Plain: down 65% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Common Grackle in Lower Great Lakes / St. Lawrence Plain is projected to fall about 34% by 2029 — from 27 in 2024 to a central estimate of 18 (95% range 1.8–34). A 5-year backtest shows a typical error of ±8.3%, with 100% of held-out values landing inside the 95% band.

-34%Change by 2029
18Projected 2029 index
1.8–3495% range
±8.3%Backtest error
19662029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
2025226.138
2026215.037
2027204.036
2028192.935
2029181.834

Routes In Lower Great Lakes / St. Lawrence Plain

Routes recording Common Grackle in Lower Great Lakes / St. Lawrence Plain.
MacdougallNEW-YORK1912024
PeruOHIO1381978
Slippery RkPENNSYLVANIA961994
NaplesNEW-YORK762024
GarrettsvileOHIO761991
HebronOHIO702024
Cicero CtrNEW-YORK672024
RomulusNEW-YORK642000
HamburgNEW-YORK592024
Ballston LkNEW-YORK541995
North EastonNEW-YORK502024
HarmonsburgPENNSYLVANIA502023
LucerneOHIO492024
New SomersetOHIO481993
HiramOHIO482021
N VictoryNEW-YORK441972
Ferris CrnrsPENNSYLVANIA402024
ChurchvilleNEW-YORK392024
AkeleyPENNSYLVANIA381979
OgdensburgNEW-YORK372024
EspyvillePENNSYLVANIA362024
HopkintonNEW-YORK352021
RushvilleNEW-YORK322024
LattasburgOHIO312024
BranchportNEW-YORK302024

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.